@VDB: Thanks – yes, each of the nanoKontrol's controls can be mapped to any MIDI controller you like via a little editor app. Never looked the Novation Launch Control XL though, as it is way too large for what I need:
(a) I just need 16 controls (not more) to have hands-on control of the Octatrack's Master and Cue levels (OT Cue configuration is set to Studio Mode). I do not use the nanoKontrol's push buttons.
(b) The controller had to be roughly the same size as the Akai LPK25 keyboard (and the same weight), so that I can mount them all together.
The trouble with modular synths is not their complexity IMHO (as long as you start small & slow), but that they generate GAS more quickly & addicitve than anything else.